18537-0533 A 93 (HD 175039)

18^h 53^m 41.82^s -05° 32' 38.1" P.A. 157.00 sep 1.1 mag 9.16,10.15 Sp G5 dist. 76.98 pc (251.11 l.y.)

Coord 2000	18537-0533		Discov num	A 93		Comp			Coord arcsec 2000	18 53 41.82 -05 32 38.1
Date first	1900		Date last	2018		Obs	57
Pa first	325		Pa last	156.5		P.A. Now (θ)	156.5°
Sep first	0.3		Sep last	1.061		Sep. Now (ρ)	1.061"
Mag pri	9.16		Mag sec	10.15		delta mag (ΔM)	0.99		Spectral class	G5 (yellow)
Pri motion ra	-024		Sec motion ra	-024
Pri motion dec	-033		Sec motion dec	-033
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Name	HD 175039		Constellation	Scutum		SAO	142763		HIP	92726
Tycho2	5123-00107-1		Gaia DR2	4254066700409019008		HD	175039		ADS	11791
BD	BD-05 4798		Distance	76.98		Distance ly	251.11

ORBITAL ELEMENTS

Period (P)	441.6413y	± 204.8833	Periastron (T)	1911.82y	± 1.263	Semi-major axis (a)	0.99123a	± 0.18535
Eccentricity (e)	0.77034	± 0.06324	Inclination (i)	51.904°	± 12.381	Longitude of periastron (ω)	322.677°	± 17.204
Node (Ω)	22.154°	± 9.754	Notes	n		Reference	Izm2019
Equinox			Last observation	2015		Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	150.1	0.906
2001	150.5	0.914
2002	150.8	0.921
2003	151.2	0.929
2004	151.6	0.937
2005	151.9	0.944
2006	152.3	0.952
2007	152.6	0.960
2008	153.0	0.967
2009	153.3	0.974
2010	153.6	0.982
2011	153.9	0.989
2012	154.3	0.997
2013	154.6	1.004
2014	154.9	1.011
2015	155.2	1.018
2016	155.5	1.025
2017	155.8	1.032
2018	156.1	1.040
2019	156.4	1.047
2020	156.7	1.053
2021	156.9	1.060
2022	157.2	1.067
2023	157.5	1.074
2024	157.8	1.081
2025	158.0	1.088
2026	158.3	1.094
2027	158.6	1.101
2028	158.8	1.107
2029	159.1	1.114
2030	159.3	1.120

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds18537-0533b.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic